package java67_7;

import java.util.Scanner;

public class ScoreAverage {

	public static void main(String[] args) {
		// avg
		Scanner in = new Scanner(System.in);
		int sum = 0;
		for (int i = 1; i <= 30; i++) {
			sum = sum + in.nextInt();
		}
		int avg = sum / 30;
	}

}
